It is a rectangle which is similar to the base.
Circle
rectangle
It is sometimes referred to as the shape's "plan".
If horizontal, a circle. If vertical, a semi-circle.
It is a rectangle which is similar to the base.
If the cylinder is standing on its flat face, the horizontal cross section is a circle. Otherwise, it is a line or a rectangle.
Circle
rectangle
A circle
a square
cone
a square
It is sometimes referred to as the shape's "plan".
No because it would be smaller.
They are all circles. The vertical and horizontal have the same radius as the ball while the angled cross section has a smaller radius.
If horizontal, a circle. If vertical, a semi-circle.